Merge origin/master (v0.5.81) into gitea/new_feature

Resolve conflicts:
- streamingHandler.js: merge buildStreamErrorBytes onAbortTerminal + local shouldPersistRequestDetail & streamStatusForContent
- capabilities.js: preserve server-injected user-asserted caps and models.dev catalog lookup; wire CommandCode /alpha/generate caps inside resolve()
- commandcode.js (services/usage): adopt upstream whoami + billing credits/subscriptions with 5h/weekly rate windows and plan caps
- openai-to-commandcode.js: merge toNativeImageBlock (data-URI & http(s) support) and assistant reasoning_content preservation
- commandcode-to-openai.js: adopt upstream mid-stream error throw for clean retry and abortion
- tests: sync commandcode test suite and exclude .next from vitest config

tests/unit/commandcode-to-openai.test.js

@@ -139,25 +139,23 @@ describe("commandcode-to-openai — finish", () => {
 });
 
 describe("commandcode-to-openai — error event", () => {
-	it("emits an OpenAI-shaped error chunk instead of fake success content", () => {
-		const { chunks } = feed([
-			{ type: "error", error: { type: "server_error", message: "Boom" } },
-		]);
-		expect(chunks[0].error).toEqual({ message: "Boom", type: "server_error" });
-		expect(chunks[0].choices[0].delta.content).toBeUndefined();
-		expect(chunks[1].choices[0].finish_reason).toBe("stop");
-		expect(JSON.stringify(chunks)).not.toContain("[CommandCode error:");
+	it("throws rather than emitting fake success content with stop chunks", () => {
+		expect(() =>
+			feed([
+				{ type: "error", error: { type: "server_error", message: "Boom" } },
+			]),
+		).toThrow(/\[CommandCode error:.*Boom/);
 	});
 
-	it("keeps the stream terminal so clients do not hang waiting for more", () => {
-		const { chunks } = feed([
-			{ type: "start" },
-			{
-				type: "error",
-				error: { type: "server_error", message: "Network connection lost." },
-			},
-		]);
-		expect(chunks[0].error.message).toBe("Network connection lost.");
-		expect(chunks[1].choices[0].finish_reason).toBe("stop");
+	it("throws on mid-stream error so stream handler can retry or abort cleanly", () => {
+		expect(() =>
+			feed([
+				{ type: "start" },
+				{
+					type: "error",
+					error: { type: "server_error", message: "Network connection lost." },
+				},
+			]),
+		).toThrow(/\[CommandCode error:.*Network connection lost/);
 	});
 });